Telephone switch system



(No Model.) 3 Sheets-Sheet 1.

G. G. GOULD & W. SMIT-H. TELEPHONE SWITCH SYSTEM.

No. 355,929. Patented Jan. 11,1887. b @ya ,Q @MISES a sheets-'sheen 2.

(No Model.)

G. C. GfOUL'D4 8v W. SMITH. TELEPHONE SWITCH SYSTENL Eid 3 sheetssheets.

o. o. GOULD an' W. SMITH. TELEPHONE SWITCH SYSTEM.

No. 355,929. y1/Patented Jan. 11, 1887.

(No Model.)

N PETERS. Phufu-uahngmpner. wnningmn, nc,

UNrre Srarss i ArtNr. trice..

CLAUDE C. GOULD'AND NVALTON SMVITH, OF BATAVIA, ASSIGNORS OF ONE- iFOURTH TO PHlLlP XV. SORIBNER, OF TONAVVANDA, NEV YORK.

TELEPHONE SWITCH SYSTEM;-

SPECIFICATION forming part of Letters Patent No. 355,929, dated January11, 1887.

Application filed September 2, 1886. Serial No. 212,450. No mudcl.)

To all whom z' may concern..-

Beit known that we, CLAUDE G. GoULD and WALTON SMITH, of Batavia, in thecounty of Genesee and Sl ate of New York, have invented new and usefulImprovements in Telephone Switch Systems, of which the following is aspecification.

This invention relates to a switch-board system in whicheach main orsubscribers line IO is provided in the central office with a movableterminal, which is automatically moved out of its normal position so asto break the connection with the ground upon sending a current throughthe line. A switch-board system of this kind is described and claimed inanother application for patent inthe United States iiled by us February23, 1886, Serial No. 192,755. In our former application for patent theautomatically-inovable terminal is applied to a system ofground-circuits.

The principal object of our present invention is to render theautomatically-movable terminal applicable to a system containing lmetallic circuits.

Ourinvention consists oftheimprovements,

which will be hereinafter fully set forth, and pointed out in theclaims.

In the accompanying drawings, consisting of three sheets, Figure l is adiagram representing three sectional switch-boards of a central otliceprovided with our improved system.

Fig. 2 is a diagram representing the manner of connecting thesubscribers on one section each with the other, and also how saidsubscribers are reached from either of the other sections. Fig. 3represents a sectional elevation of-one ofthe switch-levers,annunciators, and connecting parts on an enlarged scale. Fig. 4 is asectional elevation in line .fr w, Fig. 3, 4o looking forward. Fig. 5 isa front elevation of the vibrating lever. Fig. 6 is a side elevation ofthe front portion of the same on an enlarged scale. Fig. 7 is ahorizontal section in line i/ y, Fig. 3. Fig. 8 is a top plan View ofone oi' the levers. Fig. 9 is a fragmentary rear elevation of theswitch-lever. Fig. l0 is a diagram representing a through connectionbetween a metallic-circuit subscriber and a groundcircuit subscriber.Fig. ll is a dia- 5o gram representing a local connection between nectedwith the ground by a wire, d6.

a metallic-circuit subscriber and a ground-circuit subscriber.

Like letters of reference refer to like parts in the several figures.

A Al A2 represent three sectional switch- '55 boards, arranged side byside, the upper portions, c, of which are preferably arrangedvertically, or at right angles to the lower or table portions, c. Eachtable portion a of the sections A A A2 is provided with a number of 6odisks or rings, D. These disks are preferably constructed of guttapercha, wood, or other suitable non conductive material, and are iirrnlysecured in openings formed in thetable portions a' in any'suitablemanner. Each disk 65 is composed of two parallel parts, d d, ar-V rangedone above the other, and are connected by a central hub, di, as clearlyshown in Fig. 3. The Iupper part, d, of each disk is provided with acontact-point, d", and the lower part, 7o d, with a contact-point, d,arranged below the point di. The Apoints d d* are connected by ametallic bowspring, (Z5, which is con- The spring d5 engages with itslower portion, dl, 75 against the under side of a nose, d3, formed inthe point dt, and with its upper portion, d, against the lower end ofthe point d3, wherebyv both points d3 and d* are connected with. theground when the parts are in the p-osition 8o shown in Fig. 3. The bowd5 practicallyforms a movable connecting terminal between the twocontactpoints d3 d4 of the'main circuit. The contact-spring d5 issecured to the front end of the lower forwardly-bent portion of avertically-movable switch-bar, E, arranged in rear of the verticalportion a of the sections. The bar E is guided in its movement by screwse, passing through slots e', which are secured in brackets e2. Thelatter are secured to the 9o rear side of the Vertical portion a.

ye3 e4 represent two out or dead contact-points arranged one above theother in the disks d d', respectively. The points e3 e4 are connected bymeans of cords e5 e6 with metallic contact- 95 surfaces e7 es, formed onthe opposite sides of a non-conductive plug, c, which latter is seatedin an opening, el, formed in the Vertical portion c of the section.V

F represents the annunciator; F, the base loo thereof, which is securedat its rear end to the above the disk D, and G represents a similarvertical portion a of the section, as clearly finger arranged underneaththe disk D. rIhe shown in Fig. 3. Each annunciator is profingers G Gbear in their normal position 7o vided with two aprons o r drops, j' f',which with their outer free ends against the ground are pivoted side byside at their lower ends to contact-points d3 (Z4, as shown in Fig. 1.The the front bifurcated portion, f, ofthe base F, inner ends of theiingersG G are respectively and which engage, respectively, with theirprovided with hubs g g, which are secured to upper recessed portionsover hooks or noses a vertical non-conductive tube, G2, seated ccn- 75 ff3 f4, formed on the front end of a vibrating trallyin an opening inthehub d ot' the disk D. 1o armature, f. The armature'f is pivoted in Garepresents a cup secured to the upper the usual manner to a bifurcatedstandard, f, end of the tube G2 and provided with a screwformed in thebase-plate F, and is arranged cap, G1. above two coils, Fz F. The lowerportion of g2 represents an arm formed on one side of 8O the apron j' isprovided with a downwardly- -the cup G3, and provided with a handle, g,

i5 projecting lip, 7'7, which engages, when released, w-hereby the tubeG2 and fingers G G may be against the front vertical portion, f8, of a.horimoved. The tube G2 is held against vertical zontal sliding bolt, f,arranged underneath movement by the fingers G G.

' the base F of the annunciator F. rIhe bolt H represents a step-shapeddisk of non-con- 85 f9 is suspended on hangers f1 by screws f, ductivematerial secured to the lower end of 2o passing through slots fm. thetube G2, so as to turn therewith, and pro- F1 represents a hook formedon one side of vided with a series of annular metal plates or the boltf, at the rear end thereof, and engagrings, It It h2 h h h5 h6, securedto the lower i ing in a notch or recess, F5, formed in the rear sides ofthe steps in any suitable manner. 90

side of the movable switch-bar E, near its upi t" t t i* t5 't6represent stationary metal per end, to retain the bar in an elevatedposisprings or contact-points secured to a steption. The bolt ff is heldin engagement with shaped cross-piece, il, underneath the table a', thebar E by a spring, f1, and bearing with their free ends against the Uponvibrating or slightly tipping the arunder sides ot' the rings h ZL 7a2h3 It h5 h6, re- 95 mature f5 by alight current-such as abatspectively.By this construction a unilorm 3o tery-current-the small apron f aloneis alcontact is maintained. between the parts when lowed to fall bybeing released from the hook the fingers G G are moved on the disk. f4,thus notifying the operator upon whose I represents a push-buttonarranged above table the apron j" has fallen that an operator the cap G,and provided with a downwardlyroc. on some other section or tableisabout to conprojecting metallic stem, j, moving in an opennect with saidsubscriber. Then this occurs, ing in the cap Gi The button I is providedthe operator on whosetablethe apron has fallen near its lower end withtwo metallic contactdoes not loop'inhis telephone, and thus interpoints,j jg, which are separated by a noni fere with making a connection withthe subconductor, j. 'Ihelower contact-poindji, pro- 105 scribersdesired to be reached. By giving jects outwardly, and is secured to theinner 4o the armature f5 a greater vibration, as by a side of the cupG3, and forms a spring to retain generator, the apronfis disengaged fromthe theipush-button I in an elevatedposition, as hook fis and .ispermitted to fall. The lip fT shown in Fig. 3. The free end'ot' thespring ofthe apron fstrikes the front portion of the or contact-pointj2bears against the under side tro sliding boltfu and nlovesthelatterbackwardly of a projecting nose, ji, formed on the upper and out ofengagement with the switch-bar E, end of a metallic stem, j, whichlatter' is sewhereby the latter is released and enabled to cured in anopening in the tube G'l by a screw, be moved downwardly by its spring F.This js. The latter also serves to form a communidownward movement ot'the bar E breaks the cation between the finger G and stern The 115connection between the contact-points rZ3 d point j ofthe button I isconnected with the 5o Thus, if a subscriber rings, causing the armalineK of the main circuit by means of a wire,

ture f5 to vibrate sufficiently to release the jl, ring h", andcontact-spring t". -f apron'f to produce the above-described down-Krepresentsageneratorpush-button, which ward movement of the bar E, thecircuit is is provided with a metallic stem, Z, moving in 12o brokenbetween the points eZ;i dt, and he is an opening in the cap G, andprovided at its thereby immediately notified that the call has lower endwith two metallic contact-points, Z been received at the central otlicefrom the- Z2, which are separated by a non-conductor, Z3. z fact that hecan no longer ring his bell. The The lower contact-point is secured atone end swinging movement of the apron f is limited to the inner sideot' the cup G, to retain the 125 by a nose, f, formed on the upper frontend push-button K in an elevated position. The 6o ot' the bolt f". 1free end of the contact-point Z2 bears against It is obvious that whenboth aprons are enthe under side of a nose, Z4, formed on the uppergaged with the armature f and the latter is end of a metallic stem, Z5,which' latter is sevibrated by a generator both aprons ff will cured inan opening in the tube G2 by a screw, 13o fall simultaneously. Thearmature f is held l, whereby a connection is made between the inengagement with the aprons ff by the stem Z5 and the lower finger, G.The lower usual spring, f1, point, Z2, of the button K is connected withG represents a metal Spring-finger arranged the line L of the maincircuit by means of a l wire, Il, ring h5, and contact-spring i5. Thusit will be seen that the lines K and L of the main circuit are connectedthrough the fingers G G, contact-points Z3 cZ, and spring (Z5,completing the circuit and enabling the subscriber to call the centraloftice.

m represents a stationary metallic contactpoint secured inthe cup G3underneath the contact-point j! and in line with the same. Thecontact-poiut mis connected with the operators listening-telephone M bya Wire, on', ring h4, spring 114, and a cord or wire, m2. Thereturn-wirem3 of the listening-telephone is connected with the contact-pointy" ofthe stem j by means of a wire, m4, ring h3, and spring i3. It willthusbe seen that upon depressing the push-button I, so as to form a contactbetween the pointj and nosej4 and the springpointy'2 and stationarycontact-point m, the operators listening-telephone M is looped in on themain circuit.

n represents a metallic contact-point arranged in the cup G3diainetrically opposite the point m and underneath and in line with thelower contact-spring, Z2, of the push-but ton K. The contact-pointnisconnected with the generator N by a wire, n', ring l1?, spring t2, andwire n2. The return-wire n3 of the generator is connected with thecontact-point Z of the puslrbutton K by means of a Wire, n, ring h', andspring i. Upon pressing down the button K so as to make a connectionbetween the point Z and nose Z* and the point Z2 and stationary contactn, the generator N is looped in on the main circuit.

-N represents the battery push-button, the metallic stem n of which isprovided with a contact-point, n, which is connected with a battery, N2,by means of a wire, nl, ring Zz, spring i, and wire u8. The oppositewire, n, ofthe battery N2 is grounded, as clearly shown in Fig. 3,andestablishes a contact through the ground with the groundwire of thebow (Z5.

`o o represent two-metallic contact-points secured to the rear side ofthe vertical portion a ot' the section, and arranged one above theother, as clearly shown in Figs. 3 and-9.

o2 represents a bow-spring secured to one side of the upper conductiveportion, E', of the switch-bar E, and which is arrangedv between thecontact-points o o and bears against the under side of the contact-pointo when the parts are in their normal position, as shown in Fig. 3. Theupper portion, E', of the bar Eis separated from the lower portion, E2,by a non-conductor, E, which connects the two portions of the bar. Vhenthe parts are in their normal position, as shown in Fig. 3, thesubscribers line o3 enters the central ofiice from one side of hisinstrument through the contact-point o, to and through the annunciatorF, to the contact-point o', line K, spring t6, metal ring 7L, wirejl,contact-pointy?, metallic stemj-uger G, and coutactpoint d3, and returnsthrough the contact-bow Z5 to the coutact-point d, finger G', metallicstem Z5, to the 'contact-point Z2, wire Z7, ring h5, contact-spring i5,and line L, to the opposite side of the su-bscribers instrument.

p p represent a series of local contact-points secured to the disks dd',the points p p' being arranged in pairs one above the other vin the twoparts d d of each disk, so that when the fingers G G are turned toengage with a pair of said points the finger G will engage with theupper point, p, and the finger G with the lower point, p', as shown inFigs. 2 and 3.

Each disk D is provided with as many pairs oflocal contact-pointsp p asthere are subscribers on the table, less one, and each of thesecontact-points of one section is numbered to correspond with the numberof the subscribers with which it is connected. Forinstance, thesubscriber-s disk D No.1 isprovided with two pairs ot' localco1itact-points,pp, which are numbered 2 and 3. The subscribers disk No.2 has a similar number of contactpoints.

which are numbered 1 and 3, and the subscribl i ers disk No. Shas itscontact-points p 19 numbered 1 and 2. It No. 1 subscriber calls andthereby releases the apronf and switch-bar E, as above described, theoperator raises the bar E by a handle, E4, so as to again complete thecircuit by connecting the points d3 and d* by the bow-spring The bar E,whenlifted by the operator, does notengage with the hook ofthe slidingboltf", as thelatter is held back out of engagement with the bar by thelip f7 lof the fallen apron f. He then loops in his listening-telephoneby pressing on the button I and ascertains that the subscriber Wants,for instance, No. 2. The operator againv allows the bar E t0 descend andbreak the connection between the fingers G- G'. The operator -now turnsthe fingers G G on the subseribers disk No. 1 to the contact-pointsp pmarked No. 2. Theuppercoutact-point,p, (No. 2,)on disk D No. 1 isconnected with the upper IOO contact-point, o, of No. 2 subscribersannunf ciator F by means of a wire,p2, and the lower point, p', (No. 2,)disk No. 1, is connected with the return-wire L of No. 2 subscribersinstrument by a leg or wire, p3, as clearly shown in Fig. 3. Theoperator now presses the generator-button K on No. 1 subscribers disk,which causes the armature f5 of No. 2sub- IIO scribers annunciator tovibrate and release its apronsff and the switch-bar E in the same manneras in the case of No. 1 subscribers first call, thereby automaticallybreaking the circuit between the points d3 d* and fingers G G on No. 2subscribers disk D. This movement rings both subscribers bellssimultaneously, notifying them that the connection between them iscompleted. No. 1 is now con nected with No. 2 by wire o3, annunciator F,contactpoint o, line K, to and through finger G, as above described, tocontact-point p, disk D,`No. 1, to upper contact-point, o, of No. 2subscribers annu nciator by wirep, and to No.- 2 instrument by wire o3,returning through instrument No. 2 to wire L, to leg p3, to contact p',No. 2, on No. 1 disk, to and through uger G', as above described, to No.1 subscribers instrument by line L. The operator now replaces the fallenaprons f j" ot both subscribcertainty than heretofore.

ers7 annunciator F, leaving them ready to be rung off. By thus replacingthe apronsf I fall, the operator again replacesthe same, and

lifts the switch-bar E by the handle E of both annunciators until theyare again in engagement with the sliding looltj'i. The operator alsoturns the fingers G G on disk No. 1 back to the points d d4, wherebyboth subscribers lines are again ready for another call. By connectingvthe various subscribers on one section in this manner we dispenseentirely with the use of the usual plugs, cords, 85e., for eff'ecting alocal connection, whereby the connection is made more rapidly and withgreater It will thus be seen that the connection between the twosubscribers is entirely metallic, whereby the trans'- mitted speech isrendered more audible and transmitted to a greater distance than whenthe usual ground or semi-metallic circuit is used.

P represents aseries ofdnpleXcontact-points 'arranged in rows in thevertical portions a of each of the sections A A A2. The number ofcontact-points P on each section corresponds with the number ofsubscribers on every other section or table. For example, section A hasnumbers 4, 5, 6, 7, 8, and 9, as this section can reach Nos. 1, 2, and 3locally. Section A has numbers 1, 2, 3, 7, 8,9, and section A2 hasnumbers 1, 2, 3, 4, 5, 6, their own local numbers not lbeingrepresentedinthecontact-pointsP. The

when the latter 1s inserted in the contactcontact-points P are providedat their upper and lower ends with separate metallic con-l tact surfacesor springs P' P". The springs P' P2 are adapted to form contacts withthe metallic contact-points c7 e", respectively, of the plug c", also tosecurely hold the plug e point P. Each annunciator is connected with allofthe contact-points P of the several sections bearing the same numberas of the annunciator by a wire, Q, or other metallic connection, whichis secured with one end to the upper conductive portion of' theswitch-bar E and connected with the upper contact-surfaces, P', of theseveral contactpoints P.

Q represents a similar wire or metallic connection,which connects thelower contactsurfaces, P", of the contact-points P in the same manner,and which is connected to the main or` return wire L of the subscribersinstrument corresponding with the annunciator with which the wire Q isconnected. For instance, thewire Q is connected with the uppercontactsurfaces, P,ofthe coni act-points No. 7 and with the switch-leverE of annunciator No. 7, and

the wire Q' is connected with the lower contactsurfaces,P2, of thecontact-points No. 7 and with the wire or line L of subscrbersinstrument No7. Thus ith'will'be seenu'l'that the -various subscribersin a central office are practicallygroupedwithin reach of each operatoron each of' the sections A A' A2, whereby We dispense with the use ofchecks, speaking-circuits, &c., between the various operators at thecentral office, and whereby all unnecessary delays are obviated.

The operation of our improved system for connecting thesubscribers onone table or section with a subscriber located on any other section ortable is as follows: For instance, subscriber No. 1 calls the centralofce'throngh the line o, annunciator F, line K, fingers G G', and lineL, as above described. The operator raises the switch-bar E, presses thebutton I, loops in the listening-telephone M, and ascertains thatsubscriber No. 1 wants, say, No. 9. The operator again allows theswitchbar E to ldrop and break the connection between the two iingers GG'. He thenturns the fingers G G' by means of the handle g3 to thedeadcontact-points e3 etof the disk D, and inserts the plug c? of disk No. 1in contactpoint P No. 9 of the section A. The connection is now madewith the contact-surfaces P' P2 by the metallic contact-surfaces eT e8of the plug e, and with the fingers G G' by the wires or cords c5 e6 andcontact-points e364. By thus inserting the plug e the wires Q and Q' areconnected with the ngers G G', respectively. The operator now pressesthe battery-button N' on disk D, No. 1, which causes just sufficientvibration of the armature to release the apron f' of annunciator No. 9,thereby notifying the operator on whose table annunciator No. 9 islocated that an operator on some other section desires to connect withNo. 9. He therefore does not interfere, and permits subscriber No. l1 tocomplete his call. The operator of section A now releases thebattery-button N' and presses the generator-button K on disk D No. 1,thus ringing through wire Q, finger G,to the upper contact, P',plug-contact c7, to switch-bar E of' subscribers annunciator No. 9, tothe upper contact-point, o, of the same, to and through annunciator No.9, to contact o', to fingers G G', disk No. 9, returning by wire Q' tofinger G on disk D No. 1. This movement causes the apronf of subscribersannunciator No. 9 to fall also and disengage the switch-bar E, therebydisconnecting the fingers G G' on disk D No. 9, as in the *case of No. 1subscribers first call. This movement also rings the bells ontheinstruments of both subscribers, notifying them that the connectionbetween them is completed. Subscriber No. 1 is now connected withsubscriber No. 9 to and through the ICO IIO

nger G, as above described, wire e5, contact A `to the lowercontact-surface, P2, of point No.

9 on section A, to the lower plug-contact, es, to wire e, to lowerfinger, G, to line L of the instrument of subscriber No. 1, thuscompleting the metallic circuit. The operators now replace the fallenaprons f f on annunciators l and 9, ready to be rung off. Any electricaldisturbances-such as electric -light wires crossing the lines,lightning, or other electrical disturbances or currents which mayinfluence the main linesufiicient to vibrate the armaturef-will beinstantly turned off by the bar E moving downward and breaking theconnection between the iingers G G', thus breaking the circuit, therebyinsuring the system against fire.

Fig. l is a diagram showing a subscribers line No. 3 having a metalliccircuit connected with subscriber7 s line No. 9 having a ground circuit.Such a connection may become necessary when the same central office hassubscribers with these different circuits, or when a subscriber in oneyplace having one of these circuits is connected with a subscriber inanother place having a different circuit.'- As shown in Fig. 10, thelower linger, G', of the ground-circuit subscriber No. 9 is grounded.The metallic circuit of subscriber No.8 is also grounded by aground-connection made by the lower wire, Q', as shown.

Fig. 11 is a diagram showing local connection between a subscribers lineNo. 8 having a metallic circuit and a subscribers line No. 9 having aground circuit. In this case the lower contact-point, p', No. 9 isgrounded on "disk D No. 8 and on any other disk on the same table onwhich it may appear.

The bow di constitutes the automaticallymovable contact-piece which isinterposed in the central oiIice between the twc terminal points of themetallic circuit, and which completes the circuit through which thesubscriber reaches the central office. This movable contact-piece, uponbeing automatically moved out ofits normal position, leaves the lineopen and ready to be connectedwith the terminal points of anothermetallic circuit. The operator, by calling the line which is to beconnected with the calling line, opens the called line automatically,whereby the called line is made ready for, connection with the callingline. When the contact-piece d5 is in its normal position,it connectsthe movable terminal fingers GG of the line by means of thecontact-points d3 dt, and when the line has been opened by moving theconnecting-bow d5 out ot'its normal position the line is ready to beconnected by the fingers G G with the terminals of another metalliccircuit.

IVe claim as our inventionl. Ina switch-board system, the combinalion,with a metallic-circuit line having two contact-points connected withdifferent portions of the line, of a movable contact-piece whichconnects both contact-points when in its normal position, therebycompleting the circuit, and shifting mechanism, substantially asdescribed, connected withl said contact-piece, whereby the latter isautomatically separated from said contact-points by a current passing '73. In a switch-board system, the combination, with ametallic-circuitline, ot' a movable contact-piece which completes thecircuit when in its normal position, an annunciator, andmechanism,substantially as described, where-v, by the annunciator'andthe movable contact- Apiece are operated simultaneously, substantiallyas set forth.

4. In a switch-board system, the .combination, with a metallic-circuitline, of terminal fingers G G, contact-points d3 d, contact-piece d5, abar, E, to which said contact-piece is attached, and mechanism,substantiallyv as described, .whereby the bar E is operatedautomatically, substantially as set forth. f

5. The combination, with the main line and its terminals, of a bar, E,carrying a contactpiece, d5, a movable bolt,f9, an apron, f, anarmature, f5, and coils F2 F3, substantially as set forth.

6. The combination, with the main line and jfA its terminals, of a bar,E, provided with a portion, E2, carrying a contact-piece, d5, a'portion,E', carrying a contact-bow, 02, and a non-conductive portion, E3,between the portions E. and

E2, contact-pieces o o', arranged in the main line, and alocking-bolt,f, whereby thebow o'l is heldin contact with the contact-point o,

`substantially as set forth.

7. The combination, with the bar E, carrying a contact-piece, d5, of thelocking-bolt f9 and an annunciator-apron, f, provided with'a lip,f7,whereby the locking-bolt is operated to release the bar E when the aprondrops, substantially as set forth.

8. The combination, with the bar E, carryinga contact-piece, d 5,ofananuunciator-apron, f. provided with a lip, f7, and a locking-bolt, f,provided with a nose,f1, whereby the drop of the apron is limited,substantially as set forth.

9. The combination, with the bar E, carrying a contact-piece, d5, andprovided with a notch, F5, of a locking-bolt, f, provided with a hook,F, and a retracting-spring, fm, substantially as set forth.

l0. The combination, with theannunciatorcoil, of two aprons and anarmature-lever pro, vided with locking-hooks of different lengths,whereby'one apron is released byashort movement of the lever and theother apron by a longer movement of the lever, substantially as setforth. v

11. The combination, with the annuncatorcoil, of two aprons, pivotedsideby side, and an armature-lever provided with two lockinghooks ofdifferent lengths, arranged side by side, whereby one apron is releasedby ashort movement ot the lever and both aprons are released by a longmovement of the lever, substantially as set forth.

12. The combination, with the annuneiatorcoil, of two aprons, anarmature-lever provid ed with locking-hooks ol' different Length, and abattery producing a light current and a generator producing a strongcurrent, both, ca-

pable of being connected with the annunciator coil, substantially as setforth.

13. rlhe combination, with the disk D, ofthe terminal ngers G G',secured to a noncon ductive carrier, G2, and connected, respectively, todifferent portions, K L, of the main line, substantially as set forth.

14.-. The combination, with the disk D, provided with a pair of throughcontact-points, 19 p', of separate terminal fingers, G G', connectedtodifferent portions of the main line and adapted to be placed in contactwith the points 1o p', substantially as set forth.

15. The combination, with the terminal finger G, of the stem ja,connected with the iinger G, the button I, provided with contactpointsj'jz, a stationary contact-point, m, and a listeningtelephone connectedwith the contact-points m and j', substantially as set forth.

16. The combination, with the terminal finger G', of the stem l,connected with said finger, the button K', provided with contactpointsZ' Z2, a stationary contact-point, mand l,

a generatorconnected with the contact-points a and Z', substantially asset forth.

17. The combination, with the separateterminal fingers G G', the batteryN2, and the battery push-button 1 ofthe automatically-mov ablecontact-piece d5, provided with a groundconnection, d, substantially asset forth.

vided with dead contact-points e e4, of the terminal lingers G G',adapted to be placed in contact with the points c3 6*, a plug, e9,provided with two separate contact-surfaces, e7 e8, wires e5 e6,connecting said surfaces, respectively, with the points c3 e, and acontact-point, P, adapted to receive the plug c, and provided With twoseparate contactfsurfaces, P' P2, and conductingwires Q Q',substantially as set forth.

20. ln a switch-board system, the combination, with two or moresections, each provided with a series of duplex local contact-points anda series of duplex through contact-points, P, numbered on each sectionto correspondwith the local points on the other sections, and eachhaving two contact-surfaces, P' P2, ot' wiresQ, connecting thecontact-surfaces P' of the contact-points P having the same number onthe several sections with the movable bar E ofthe correspondingannunciator, and wires Q', connecting the contact-surfaces P`l of` thecontact-points P having` the same number on the several sections withthe corresponding subscribers line, substantially as set forth.

Vitness our hands this 25th day of August, 1886.

CLAUDE C. GOULD. VALTON SMITH.

Vitnesses:

JNO. J. BoNNnn, Oscar: SGHAUB.

